Ceph

The postinst script for the cephadm deb (from download.ceph.com) has the following:

1. set up (initially empty) .ssh/authorized_keys file
   if ! test -d /home/cephadm/.ssh; then
   mkdir /home/cephadm/.ssh
   chown --reference /home/cephadm /home/cephadm/.ssh
   chmod 0700 /home/cephadm/.ssh
   fi
   if ! test -e /home/cephadm/.ssh/authorized_keys; then
   touch /home/cephadm/.ssh/authorized_keys
   chown --reference /home/cephadm /home/cephadm/.ssh/authorized_keys
   chmod 0600 /home/cephadm/.ssh/authorized_keys
   fi
   ```
   Our hosts have /home automounted, which results in an error as that directory cannot be created.

Most other Ubuntu debs seem to use /var/lib/NAME for service users to avoid this. Could this be done here? Or at least catch the errors if /home isn't writeable?

As an aside, I'm not sure what the benefit of creating an .ssh dir and empty authorized_keys file is here, as opposed to being done in cephadm bootstrap when keys are actually created for the user running cephadm, but that's probably a separate issue!

This looks like a variation on https://tracker.ceph.com/issues/43285